Tajima TFHXII-Not sewing need help

Have a 4-head sewing hats just fine. Switched from hats to flats and now it traces fine, but starts sewing a few stitches-slowly then seems like it stops, then moves a little, tries to start sewing again, stops, moves and starts sewing again - not the design that is loaded, looks like random stuff....sometimes gives me a 211 message - tried thread trim...not sure what to try now....any suggestions. Thanks,

Location: 
United States